it's m it's more polluting, but it's more plentiful says energy analyst dave hackett. >> it will raise gasoline at thetion upwards of 10%. so it's like addinganother oon.nery. >> reporter: he says the fever thanhe pump has been broken and prices will fall soon. >> it will be lower tomorrow than it is today. .ait it out because it's coming down. >> reporter: scott, history shows prices rarely fall as fast re they go up. they should be back where they were before the spike in about a eonth. >> pelley: warm and sunny there, bill, but a lot of the country is getting a preview of winter. early morning temperatures is g plunged into the 40s, 30s, even the 20s in some places. ces cold-weather records have fallen since friday. this morning in dallas/fort worth the mercury dipped to 39. in abilene, texas, 34, and in , aahoma city 31. down right freezing. an experimental drug shows promise in the fight against alzehimer's disease. that's next. but after awhile even my girlfriend noticed a difference. [ male announcer ] rogaine is proven to help stop hair loss. and for 85% of guys, it regrew hair